There has been no shortage of speculation on the fate of HBO's popular fantasy drama -- which can now claim to have the most Emmy nominations this year. There's a growing concern that the show will catch up to "Game of Thrones" author George R.R. Martin before he completes the sixth installment in the series.

But HBO bosses Richard Plepler and Michael Lombardo told reporters Thursday during the network's session at the Television Critics Assn. press tour in Beverly Hills that viewers need not stress.

George is an integral part of the creative team on this," said Lombardo, HBO's president of programming. "Every step, every movie is being choreographed very closely with him after next year. We will have to figure it out with George if his book isn't finished."

Plepler, HBO's chairman and chief executive, added: "We are not talking about ending the show within the next two years."

And in case it requires triple assurance:

"We are not talking about ending the show within the next two seasons."